I am studying how the Satellite Based Augmentation System (SBAS) or the Ground Based Augmentation System (GBAS) affect the Instrument Approach Procedures, and I noticed that in ICAO's Aircraft Operations manual (8168, Volume II) it states:
Part III, Section 3, Chapter 5, 5.3.1: "General. In the intermediate approach segment any sensor can be used; however, the transition to the SBAS navigation shall be made 3.7 km (2.0 NM) prior to the FAF.
Part III, Section 3, Chapter 5, 5.3.2: Alignment. The intermediate approach segment of an SBAS procedure shall be aligned with the final approach segment.
Part III, Section 3, Chapter 6, 6.3.2: "The intermediate approach segment of a GBAS procedure shall be aligned with the final approach course."
Does the above quotes imply that the intermediate segment must be aligned with the final segment 2.0NM prior to the FAF, in order for the aircraft to be able to switch to SBAS navigation?
In addition, concerning both SBAS and GBAS, I would like to make sure if the rule concerning the alignment of the intermediate segment with the final segment implies that the whole segment (each leg of the intermediate segment) has to be aligned with the final, rather than only the last leg.
Could someone point me in the right direction?